Physics Practice Problems 6-3
1.
A 110-N force and a 55-N force both act on an object point P. The 110-N force acts at 900. The 55-N force
acts at 00. What is the magnitude and direction of the resultant force?
2.
A motorboat travels at 8.5 m/s. It heads straight across a river 110 m wide.
a. If the water flows downstream at a rate of 3.8 m/s, what is the boat's resultant velocity?
b. How long does it take the boat to reach the opposite shore?
3.
A boat heads directly across a river 41 m wide at 3.8 m/s. The current is flowing downstream at 2.2 m/s.
a. What is the resultant velocity of the boat?
b. How much time does it take the boat to cross the river?
c.
4.
How far downstream is the boat when it reaches the other side?
A 42-km/h wind blows toward 2150, while a plane heads toward 1250 at 152 km/h. What is the resultant
velocity of the plane?